Selling on ebay has become "cut-throat" business. 
Compare the price of anything........literally anything, compare your cost price + ebay charges+shipping cost+paypal charges, and still if you can make $0.50/item than you are better off. Million dollar question is, how many item you will sell to make resonable amont of profit in a month. For instances, just over look the return, complain, refund, replacement you have to make.